Medicament delivery device

Abstract

The present invention relates to a medicament delivery device (10) comprising a housing (12, 14); a medicament container holder (90), arranged movable in relation to said housing (12, 14) and capable of accommodating a medicament container (92); an biased activator (160) comprising a plunger rod (164), which plunger rod (164) is arranged to act on the medicament container (92) for delivering a dose of medicament through a medicament delivery member (102 when said biased activator (160) is operated; a manually operable dose setting member (72) operably connected to both said housing and said medicament container holder such that manual operation of said dose setting member (72) will cause the medicament container holder (90) with the medicament container (92) to move towards said plunger rod (164) for setting a dose of medicament to be delivered; a dose drum (56) releasably connected to the dose setting member (72) through a releasable connection mechanism (68, 84I) such that when the dose setting member is operated, said dose drum (56) is displaced from an initial position to a set dose position; a release mechanism (116) operably connected to said biased activator (160), wherein, when said plunger rod (164) is moved to an end position of the dose delivery operation, said release mechanism (116) is arranged to act on said connection mechanism (68, 84I) for releasing said dose drum (56) from said dose setting member (72). The invention is characterised in that said release mechanism is arranged with a locking mechanism (130, 84II) arranged to lock said dose setting member (72) from displacement as the connection mechanism (68, 84I) is operated for releasing said dose drum (56) from said dose setting member (72).

The invention claimed is: 
     
       1. A medicament delivery device comprising a housing:
 a medicament container holder, arranged movable in relation to said housing and capable of accommodating a medicament container; 
 a biased activator comprising a plunger rod, wherein the plunger rod is arranged to act on the medicament container for delivering a dose of medicament through a medicament delivery member when said biased activator is operated; 
 a manually operable dose setting member operable connected to both said housing and said medicament container holder such that manual operation of said dose setting member will cause the medicament container holder with the medicament container to move towards said plunger rod for setting a dose of medicament to be delivered; 
 a dose drum releasably connected to the dose setting member through a releasable connection mechanism such that when the dose setting member is operated, said dose drum is displaced from an initial position to a set dose position; 
 a release mechanism operably connected to said biased activator, wherein, when said plunger rod is moved to an end position of a dose delivery operation, said release mechanism is arranged to act on said connection mechanism for releasing said dose drum from said dose setting member; 
 characterised in that said release mechanism is arranged with a locking mechanism arranged to lock said dose setting member from displacement as the connection mechanism is operated for releasing said dose drum from said dose setting member. 
 
     
     
       2. The medicament delivery device according to  claim 1 , further comprising a first resilient member arranged between the dose drum and the housing. 
     
     
       3. The medicament delivery device according to  claim 2 ,
 wherein the first resilient member is tensioned when the dose setting member is operated such that the dose drum is displaced from the initial position to the set dose position. 
 
     
     
       4. The medicament delivery device according to  claim 3 ,
 wherein the first resilient member is capable of moving the dose drum back from the set dose position to the initial position when the dose drum is released from the dose setting member. 
 
     
     
       5. The medicament delivery device according to  claim 1 ,
 wherein the connection mechanism comprises at least one resiliently arranged protrusion on the dose setting member engageable with at least one cut-out on said dose drum. 
 
     
     
       6. The medicament delivery device according to  claim 1 ,
 wherein the connection mechanism comprises at least one resiliently arranged protrusion on one of the dose drum engageable with at least one cut-out on said dose setting member. 
 
     
     
       7. The medicament delivery device according to  claim 1 , wherein the release mechanism comprises a release sleeve. 
     
     
       8. The medicament delivery device according to  claim 7 ,
 wherein the locking mechanism comprises at least one resiliently arranged protrusion on one of the dose setting member or the release sleeve engageable with at least one cut-out on the other of the release sleeve or the dose setting member. 
 
     
     
       9. The medicament delivery device according to  claim 8 ,
 wherein the dose setting member comprises at least one arm resiliently movable in a longitudinal direction of the medicament delivery device. 
 
     
     
       10. The medicament delivery device according to  claim 9 ,
 wherein the at least one arm is arranged with a protrusion arranged to engage in a cut-out of said dose drum to create the connection mechanism. 
 
     
     
       11. The medicament delivery device according to  claim 10 ,
 wherein the at least one arm is arranged with a protrusion arranged to engage in a cut-out in the release sleeve for creating the locking mechanism. 
 
     
     
       12. The medicament delivery device according to  claim 1 ,
 wherein the release mechanism further comprises rotational locking elements arranged to lock the dose drum and the dose setting member during delivery of the dose. 
 
     
     
       13. The medicament delivery device according to  claim 1 ,
 wherein the dose setting member comprises a locking element configured to interact with a corresponding locking element of the housing for releasably locking rotational positions of the dose setting member during setting of a dose and for providing tactile and audible information during setting of the dose. 
 
     
     
       14. The medicament delivery device according to  claim 13 ,
 wherein the locking element is a recess on an outer surface of the dose setting member and the corresponding locking element is a protrusion on an inner surface of the housing. 
 
     
     
       15. The medicament delivery device according to  claim 1 ,
 further comprising a dose limiting mechanism operably arranged between the dose drum and the housing, capable of limiting the maximum dose to be set. 
 
     
     
       16. Medicament delivery device according to  claim 15 ,
 wherein said dose limiting mechanism comprises a groove extending a distance along a circumference of said dose drum arranged to interact with a stop ledge on said housing, wherein the turning of the dose setting member will bring the stop ledge in contact with an end of said groove within one turn of the dose setting member, limiting the maximum dose to be set. 
 
     
     
       17. Medicament delivery device according to  claim 1 ,
 further comprising a last dose mechanism operably arranged between the medicament container holder and said dose setting member and capable of limiting the maximum dose to be set to the remaining quantity of medicament in the medicament container. 
 
     
     
       18. The medicament delivery device according to  claim 17 ,
 wherein the last dose mechanism comprises a stop ledge in a proximal area of the medicament container holder, arranged to come in contact with, and limit the movement, of the dose setting member. 
 
     
     
       19. The medicament delivery device according to  claim 1 ,
 wherein the biased activator comprises a manually operable push button extending in a distal direction through the housing. 
 
     
     
       20. The medicament delivery device according to  claim 19 ,
 wherein the biased activator comprises a return force element arranged to return the biased activator after delivery of a dose medicament.